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Effectiveness of Benzimidazol and non-Benzimidazole fungicides to control warty disease of coffee

by Javed, Z.U.R.
Publisher: Oct 1977Subject(s): ENFERMEDADES FUNGOSAS | BOTRYTIS | ESPORAS | GERMINACION | CONTROL QUIMICO | FUNGICIDAS | BOTRYTIS CINEREA | EFECTOS DE LOS FUNGICIDAS | FUNGAL DISEASES | BOTRYTIS | SPORES | GERMINATION | CHEMICAL CONTROL | FUNGICIDES | BOTRYTIS CINEREA | MALADIE FONGIQUE | BOTRYTIS | SPORE | GERMINATION | LUTTE CHIMIQUE | FONGICIDE | BOTRYTIS CINEREA In: Kenya Coffee (Kenia) v. 42(499) p. 325-334Summary: Effects of two benzimidazole and three non-benzimidazole fungicides were evaluated on the mycelial growth and sporulation of three isolates of Botrytis cinerea f. sp. coffee on agar media. Conidia germinability was tested in fungicide solutions. Benzimidazole and non-benzimidazole fungicides were also used as dips on healthy flowers of different coffee varieties to compare their effectiveness in preventing infection by conidia. Mycelial growth was sensitive to benzimidazole fungicides but conidial germination was not. Conidial germination in distilled water was inhibited by captafol and Daconil (chlorothalonil). Perenox (cuprous oxide) stimulated mycelial growth and sporulation. All fungicides failed to inhibit infection of fungicide-treated healthy flowers but only low levels of infection were recorded with captafol treatments. Tolerance of B. cinerea to these fungicides may be a threat to coffee estates where `warty disease' is controlled by these fungicides. Punctured mature green berries were found to be very susceptible to infection and mycelium from such infected green berries grew out 10.0 mm in all directions and so could easily infect healthy berries close by
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Effects of two benzimidazole and three non-benzimidazole fungicides were evaluated on the mycelial growth and sporulation of three isolates of Botrytis cinerea f. sp. coffee on agar media. Conidia germinability was tested in fungicide solutions. Benzimidazole and non-benzimidazole fungicides were also used as dips on healthy flowers of different coffee varieties to compare their effectiveness in preventing infection by conidia. Mycelial growth was sensitive to benzimidazole fungicides but conidial germination was not. Conidial germination in distilled water was inhibited by captafol and Daconil (chlorothalonil). Perenox (cuprous oxide) stimulated mycelial growth and sporulation. All fungicides failed to inhibit infection of fungicide-treated healthy flowers but only low levels of infection were recorded with captafol treatments. Tolerance of B. cinerea to these fungicides may be a threat to coffee estates where `warty disease' is controlled by these fungicides. Punctured mature green berries were found to be very susceptible to infection and mycelium from such infected green berries grew out 10.0 mm in all directions and so could easily infect healthy berries close by

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